[syslinux] "Tick-counting" vs "Tick-less" timekeeping issues on VMs emulating BIOS PCs
Patrick Masotta
masottaus at yahoo.com
Wed Mar 2 23:31:02 PST 2016
>>>
> Not really, a virtual environment can easily emulate the BIOS_timer at 0x046C
> but it has problems emulating a "real" timer interrupt to be hooked...
> That's the real problem.
The timer interrupt works fine in at least KVM, Xen, VMware, and
Hyper-V. (I've tested iPXE in all of those virtual environments, and
iPXE relies on the timer interrupt actually triggering a call to an ISR
within the VM.)
Michael
<<<
Well, that contradicts what the VMware document says.
I'm still working on this; probably there are other hidden timing
issues affecting TFTP when it's run on a VM. I'll post what I find.
Best,
Patrick
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